CN101445279A - Compact cyclone air-flotation separation equipment for processing oily wastewater - Google Patents
Compact cyclone air-flotation separation equipment for processing oily wastewater Download PDFInfo
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Abstract
Compact cyclone air-flotation separation equipment for processing oily wastewater mainly consists of a cyclone air-flotation combination tank (1), a circulating gas assembly (2), a gas-liquid mixing assembly (3) and a circulating return water assembly (4), wherein, the cyclone air-flotation combination tank (1) is a key component and consists of a cylindrical external cylinder (11), an elliptical upper seal head (12) and an elliptical lower seal head (13), the cyclone air-flotation combination tank (1) is mainly internally provided with an inner cylinder (14) and an inlet guide vane (31) and is connected with a tangential inlet tube (34), and the bottom thereof is provided with an in-cylinder gas circulation line (23), an in-cylinder return water line (42), an air-flotation ejector (43), an air-flotation baffle plate (432) and a horizontal round plate (133). The cylindrical external cylinder (11) is connected with the circulating gas assembly (2), the gas-liquid mixing assembly (3) and the circulating return water assembly (4) to form the compact cyclone air-flotation separation equipment. The equipment has the advantages of compact and simple structure, high working efficiency, small space, low manufacturing cost as well as simple use, maintenance and repair, and the equipment is particularly suitable for purification treatment of the oily wastewater with micro dispersed oil drops.
Description
Technical field
The present invention relates to the equipment of oil in a kind of oily(waste)water, gas, the heterogeneous separating treatment of water, especially contain the purifying treatment separating device of the oily(waste)water of small dispersed oil droplets.
Background technology
Oily(waste)water in Petroleum and Petrochemical Industry production, urban life is medium often runs into, and implements the primary Processing tasks that oily water separation faces often with the oil content of removing wherein.The method of oily water separation is a lot, and treatment process commonly used has settling methods, centrifugal settling method, air supporting method, filtration method, absorption method, membrane separation process etc.
Various treatment processs all have separately relative merits and the specific scope of application.Air supporting method technical maturity, with low cost, treatment capacity is big, be widely used in the processing of waste water such as oil field, petrochemical complex, food oil production at present.Its main drawback is that oil slick is difficult, and the flotation residence time is longer; When treatment capacity is big, must build large-scale airfloat equipment, floor space is big, the investment cost height.Cyclone separation process based on hydrocyclone has obtained application more and more widely in oily(waste)water is handled since the nineties in 20th century, utilize oil, water biphase density difference to produce centrifugal force with oil, water sepn by swirler, have advantages such as compact construction, floor space is little, running maintenance is simple, but the oil bead diameter scope that this method can be removed is not less than 20 μ m.
In order to overcome the shortcoming of traditional air supporting and eddy flow, further strengthen the oil-water separation of air supporting method, many in recent years researchists or even relevant water treating equipment manufacturer have all proposed viewpoint that the dissolved air flotation technology is combined with cyclone separation process, have obtained some substantial achievements in research.
At present domestic cyclone air-flotation combination technique only is confined to the dissolved air flotation technology combined with the hydrocyclone monomer with liquid-liquid separation and carries out oily water separation, is in the laboratory exploratory stage.Because the monomeric processing power of hydrocyclone is very limited, when needs will many monomers in parallel and during at the suitable position injecting gas, the very trouble that just seems, so fettered its industrial applications.
The external combination technique of having released several air supportings and low strength eddy flow centrifuge field in recent years, this technology have not only overcome defectives such as the processing power of domestic research existence is low, and have obtained certain effect in the processing application facet of petroleum industry oily(waste)water.Therefore, in following one period, the combination technique of air supporting and low strength eddy flow centrifuge field will dominated the developing direction of air supporting eddy flow combined treatment technology.
In the U.S. Pat 7144503 of Norway M-I Epcon company application, set forth a kind of combined degassing and flotation tank, a cylindric inner core and a spirrillum inlet guide card are arranged in jar, oily(waste)water enters from the tangential inlet on jar top and forms eddy flow the jar, and bubble is separated out from water simultaneously.Bubble and oil droplet are depressed into inner tube wall under the effect of eddy flow, the two rises to tank deck after adhering to, and discharge by the oil gas vent of tank deck.According to the patentee's, this device is better to the treatment effect of oily(waste)water, and cost and maintenance cost are very low, are applicable to that relatively the storage of the oil production platforms of offshore operation or Floating Production unloads relatively stricter field use such as oil tanker (FPSO) space requirement of etc.ing.But from the appended structure iron of this patent, rise to some problems that exist that efflux of the oil of jar inner top and bubble scum silica frost.Especially the oil production platforms of offshore operation or FPSO can be in vibrating state because of the effect of ripple, wave, stream, this moment, a jar inner liquid level was difficult to keep stable, thereby cause the water content in the outer gentle bubble scum silica frost of oil extraction of this device too high, thereby had a strong impact on separating effect.
In the U.S. Pat 7157007 of U.S. Natco group application, a kind of oil, gas, water three-phase separating device have been set forth; this device is a vertical-type air-flotation separating tank; mainly be divided into upper, middle and lower-ranking, utilized cyclonic separation, coarse and air supporting isolation technique respectively.The mid-way that is positioned at jar top is equipped with an inner core, and oily(waste)water enters into inner core from tangential inlet and produces eddy flow, carries out oily water separation in inner core, and oil phase directly enters the oil skimming bucket.When being positioned at the coalescent layer at jar middle part, the dispersive oil droplet is grown up in this gathering from the effusive current of interior tube bottom.Part macrobead oil droplet can be under buoyancy, overcome self gravitation and the main body following upwards buoyance lift that begins to flowing mutually, from and removed a part of oil.In the jar bottom injector is installed, the gas of utilization jar inner top and backflow are purified waste water and after the shear-mixed, produce micro-bubble in injectors, the oily(waste)water that gets off from coalescent laminar flow is carried out air supporting handle.But the periodic cleaning problem of coalescent layer bothers very much, and the internal structure of whole plant is very complicated simultaneously, and the cost of processing and manufacturing is higher.
In view of the foregoing, be necessary further to develop the deficiency that novel compact type air supporting vortex separation system overcomes above-mentioned oily-water seperating equipment.
Summary of the invention
According to background technology, the objective of the invention is to avoid above-mentioned shortcoming, provide a kind of monotechnics to combine with eddy flow and two kinds of oily water separations of air supporting, make the dispersed oil droplets in the water can high efficiency separation, reach the compact cyclone air-flotation separation equipment for processing oily wastewater of purifying treatment purpose.
To achieve these goals, the present invention is achieved through the following technical solutions:
A kind of compact cyclone air-flotation separation equipment for processing oily wastewater, mainly by cyclone air-flotation Composite Can (1), recycle gas assembly (2), gas-liquid mixed assembly (3) and pump around circuit water assembly (4) are formed, wherein: by cylindrical outer cylinder body (11), oval upper cover (12) and oval lower cover (13) are formed the tank body of cyclone air-flotation Composite Can (1), recycle gas outlet (21) wherein is installed on upper cover (12), oil outlet flange (121) and gas safety valve (126), oil outlet flange (121) is connected with interior outstanding pipe (123) in the inner core (14), afterbody of outstanding pipe (123) is provided with fixed plate (124) and goes out oil groove (125) in it, the bottom of outer cylinder body (11) is equiped with pump around circuit water inlet (41), and be connected with tube internal reflux water lines (42), the end of its internal reflux water lines (42) is connected with air supporting injector (43), the middle and upper part of air supporting injector (43) is provided with injector inlet mouth (431), the below is provided with discoid air supporting baffle plate (432), lower surface (5～10) mm apart from air supporting injector (43), in the lower cover (13) of outer cylinder body (11), the top of lower cover water outlet (131) is provided with a horizontal plectane (133), and and lower cover (13) between form a circular water stream channel (134), be provided with filter screen (135) around the horizontal plectane (133), greasy filth outlet (132) also is installed on lower cover (13);
Inner core (14) is made up of spherical crown shape skimming tank (141) and cylindric oil tube (142), spination overflow weir (143) is made in the upper end of its spherical crown shape skimming tank (141), the bottom of inner core (14) and interior outstanding pipe (123) are affixed, distance H 1=50mm between the upper limb of cylindric outer cylinder body (11) and spherical crown shape skimming tank (141) upper limb, inner core (14) bottom margin is apart from upper limb distance H 2=(1/3～3/5) H of outer cylinder body (11);
Recycle gas line (24) is connected with gas circulation line (23) in recycle gas outlet (21), recycle gas inlet (22), the tube, and gas circulation pipeline (23) is connected the common recycle gas assembly (2) of forming in the tube with the inlet mouth (431) of air supporting injector (43);
Top in outer cylinder body (11), being provided with inlet guide card (31) is fixed on the inwall of outer cylinder body (11) around inner core (14), its guide card initiating terminal (32) is connected with the terminal smooth transition of the inlet tube of tangential inlet pipe (34), inlet guide card (31) is provided with along barrel circumferential direction spirrillum, lead angle is 5 °～15 °, inlet guide card (31) is 210 °～330 ° with the inscribed angle of outer cylinder body (11) inwall intersecting lens projection on horizontal plane, should leave certain radius clearance between the outside surface of inlet guide card (31) and inner core (14), the inlet (37) of tangential inlet pipe (34) is connected with gas-liquid mixing pump (36) by pipeline (35), thus inlet guide card (31), tangential inlet pipe (34), pipeline (35) and gas-liquid mixing pump (36) are formed gas-liquid mixed assembly (3) jointly;
By water inlet pipe (441), Y-tube (442) and water shoot (443) connect and compose intake-discharge pipe (44), and the water-in (444) by intake-discharge pipe (44) is connected with lower cover water outlet (131), pump around circuit water pump (45) is connected air supporting injector (43) by tube external reflux water lines (46) with pump around circuit water inlet (41), discoid air supporting baffle plate (432), tube internal reflux water lines (42), pump around circuit water inlet (41), tube external reflux water lines (46), pump around circuit water pump (45) and intake-discharge pipe (44) are formed water pumparound assembly (4) jointly.
Owing to adopted technique scheme, the present invention to have following advantage and effect:
1, the present invention has successfully realized the combination of eddy flow and two kinds of oily water separation monotechnicss of air supporting, can separate tiny oil droplets, working efficiency improves greatly, device structure body compactness, simple, the structure formation exquisiteness is specially adapted to contain the purifying treatment of the oily(waste)water of small dispersed oil droplets.
2, the present invention is stronger to the adaptability of handling flow and interior oil-containing thereof, air content fluctuation, has bigger turndown ratio.
3, structural cost of the present invention is cheap, and it is simple and easy to use installation and maintenance to repair.
Description of drawings
Fig. 1 is a structure collectivity cross-sectional schematic of the present invention
Fig. 2 is the A-A cross-sectional schematic of Fig. 1 of the present invention
Fig. 3 is the B-B cross-sectional schematic of Fig. 1 of the present invention
Fig. 4 is the C-C cross-sectional schematic of Fig. 1 of the present invention
Fig. 5 is an air supporting injector cross-sectional schematic of the present invention
Fig. 6 is another embodiment of the present invention overall structure cross-sectional schematic
Fig. 7 is a cyclone air-flotation Composite Can series system structural representation of the present invention
Fig. 8 is a cyclone air-flotation Composite Can parallel way structural representation of the present invention
Embodiment
By a kind of compact cyclone air-flotation separation equipment for processing oily wastewater of the present invention Fig. 1 to Fig. 4 illustrate, mainly by cyclone air-flotation Composite Can 1, recycle gas assembly 2, gas-liquid mixed assembly 3 and pump around circuit water assembly 4 are formed, wherein: by cylindrical outer cylinder body 11, oval upper cover 12 and oval lower cover 13 are formed the tank body of cyclone air-flotation Composite Can 1, recycle gas outlet 21 wherein is installed on upper cover 12, oil outlet flange 121 and gas safety valve 126, oil outlet flange 121 is connected with interior outstanding pipe 123 in the inner core 14, afterbody of outstanding pipe 123 is provided with fixed plate 124 and goes out oil groove 125 in it, the bottom of outer cylinder body 11 is equiped with pump around circuit water inlet 41, and be connected with tube internal reflux water lines 42, the end of tube internal reflux water lines 42 is connected with air supporting injector 43, the middle and upper part of air supporting injector 43 is provided with injector inlet mouth 431, the below is provided with discoid air supporting baffle plate 432, apart from air supporting injector 43 lower ends 5～10mm, in the lower cover 13 of outer cylinder body 11, the top of lower cover water outlet 131 is provided with a horizontal plectane 133, and and lower cover 13 between form a circular water stream channel 134, be provided with filter screen 135 around the horizontal plectane 133, greasy filth outlet 132 also is installed on lower cover 13;
Inner core 14 is made up of spherical crown shape skimming tank 141 and cylindric oil tube 142, spination overflow weir 143 is made in the upper end of its spherical crown shape skimming tank 141, the bottom of inner core 14 and interior outstanding pipe 123 are affixed, the distance H between the upper limb of cylindric outer cylinder body 11 and spherical crown shape skimming tank 141 upper limbs
1=50mm, inner core 14 bottom margins are apart from the upper limb distance H of outer cylinder body 11
2=(1/3～3/5) H;
Top at outer cylinder body 11, being provided with inlet guide card 31 is fixed on the inwall of outer cylinder body 11 around inner core 14, its guide card initiating terminal 32 is connected with the terminal smooth transition of the inlet tube of tangential inlet pipe 34, inlet guide card 31 is provided with along barrel circumferential direction spirrillum, lead angle is 5 °～15 °, inlet guide card 31 is 210 °～330 ° with the inscribed angle of outer cylinder body 11 inwall intersecting lens projections on horizontal plane, should leave certain radius clearance between the outside surface of inlet guide card 31 and inner core 14, the inlet 37 of tangential inlet pipe 34 is connected with gas-liquid mixing pump 36 by pipeline 35, thus inlet guide card 31, tangential inlet pipe 34, pipeline 35 and the gas-liquid mixing pump 36 common gas-liquid mixed assemblies 3 of forming;
By water inlet pipe 441, Y-tube 442 and water shoot 443 connect and compose intake-discharge pipe 44, and the water-in 444 by intake-discharge pipe 44 is connected with lower cover water outlet 131, pump around circuit water pump 45 is connected with pump around circuit water inlet 41 by tube external reflux water lines 46, air supporting injector 43, discoid air supporting baffle plate 432, tube internal reflux water lines 42, pump around circuit water inlet 41, tube external reflux water lines 46, pump around circuit water pump 45 and the intake-discharge pipe 44 common water pumparound assemblies 4 of forming.
Know that again the eddy flow centrifugal intensity that solution-airmixture produces in cyclone air-flotation Composite Can 1 is also very big to the influence of separation performance, ideal centrifugal intensity scope is 15～30.
Gas content in the cyclone air-flotation Composite Can 1 also will remain on a suitable scope, and the ideal vapour-liquid ratio is 9%～18%.
The bubble diameter scope that general requirement air supporting injector 43 produces is 100 μ m～300 μ m.
Other knows, at first utilize gas-liquid mixing pump 36 limits to draw water, the limit is air-breathing, in pump with oily(waste)water and gas vigorous stirring, shear-mixed becomes the uniform mixture of oily(waste)water-micro-bubble, increased the adhesion chance of dispersed oil droplets and micro-bubble, and then entered in the outer cylinder body 11, in jar, formed eddy flow on the screw via inlet guide card 31 by tangential inlet pipe 34.
Gas-liquid mixture fluid is in the jar inward turning then produce centrifugal force, and the water that density is bigger moves to the jar inwall, and radially relative migration then takes place in the middle of jar for oil droplet, the light constituents such as micro-bubble that are stained with oil droplet, the outer wall near zone of inner core 14 in arriving jar.Radial migration speed owing to dispersed oil droplets and micro-bubble in this process there are differences, and the radially interior travelling speed of micro-bubble is relatively large, thereby has increased the chance of the two contact, has improved the adhesion speed of micro-bubble and tiny oil droplets.Because near bubble-oil droplet adherend that the density of bubble-oil droplet adherend well below the density of water, therefore has been positioned at jar inner core 14 outer walls can slowly float.Most solution-air mixed stream then can the limit rotation, limit flow downward, the rotating centrifugal effect weakens gradually simultaneously, still has part bubble-oil droplet adherend and slowly float in this process.In order further to strengthen the dissolved air flotation effect, air supporting injector 43 by lower central position installation in the jar, pump around circuit water pump 45 is purified waste water pump around circuit to the middle and upper part of air supporting injector with a part, meanwhile air supporting injector 43 sucks gas from tank deck, gas is sheared in air supporting injector 43 and is broken into micro-bubble, under the mating reaction of discoid air supporting baffle plate 432, the bubble that contains of air supporting injector 43 outlet is purified waste water and is evenly distributed on the peripheral region of air supporting injector 43, strengthens the disengaging zone thereby formed a complete air supporting.In jar in the bottom waste water remaining tiny oil droplets by with bubble adhesion, form bubble-oil droplet adherend once more and float to the tank top.By forward and backward twice air supporting process, finally produce one deck water solution of oil and bubble scum silica frost on tank level top, these air supporting products finally are pooled in the inner core 14 by zigzag overflow weir 142, continuously are rejected to outside the jar by oil outlet flange 121.Gas phase part in jar is blended in the bubble scum silica frost, along with water solution of oil together outside oil outlet flange 121 drain tanks, a part rises to tank deck, this part gas that rises to tank deck is divided into two kinds of discharge modes again, a part is discharged from gas safety valve 126, another part is inhaled into from recycle gas outlet 21, enters in the jar once more to be recycled as source of the gas.Treated water, is discharged from the water outlet 131 of pot bottom behind horizontal plectane 133 unhurried currents along the bottom of tank skin flow direction jar.In addition, at the bottom of sand and other heavier particles will drop to jar, collect the back by filter screen 135 and discharge by the greasy filth outlet 132 of pot bottom with the form of greasy filth.
The cross-sectional schematic of air supporting injector of the present invention is shown by Fig. 5, air supporting injector 43 is a Venturi in fact as seen from the figure, mainly by cylindrical section 433, suction opening 434, contraction section 435, suction muffler 436, throat 437 and expansion section 438 are formed, wherein the top of air supporting injector 43 is connected with pipeline 42 in the tube by flange, import purifying waste water of having handled by pump around circuit water pump 45 from lower cover water outlet 131, suction opening 434 is connected with gas circulation pipeline 23 in the tube, so that suck gas from recycle gas outlet 21.
By Fig. 6 another embodiment of the present invention is shown, the injector installation site that mainly is pump around circuit water assembly 4 is different, pump around circuit water pump 45 is extracted a part of purifying waste water of having handled out from lower cover water outlet 131, being positioned at two laterally disposed injectors of outer cylinder body 11 external bottoms 43 is connected with pump around circuit water pump 45 by tube external reflux water lines 46, peripheral jet goes into to contain the current of micro-bubble in jar, wherein gas exports 21 along recycle gas line 24 by the recycle gas of outer cylinder body 11, enter into suction muffler 436 from air inlet port 47 and be sheared into micro-bubble, in the suction muffler 436 is the vacuum low-pressure district, the gas-liquid mixture that tangentially enters screw rotation in jar is carried out eddy flow to oily(waste)water, the air supporting combined treatment.
Compact cyclone air-flotation Composite Can 1 of the present invention can be taked the mode of operation of serial or parallel connection according to different performance requirements such as working flows.
Fig. 7 illustrates 3 placed in-line mode of operation of compact cyclone air-flotation Composite Can, the water outlet of previous Composite Can is as the water inlet of next Composite Can, the oil that oil outlet is discharged is pooled in the same pipeline, and this mode of operation can improve the separation efficiency of compact cyclone air-flotation Composite Can.
Fig. 8 illustrates the mode of operation of 2 compact cyclone air-flotation Composite Cans parallel connection, the two independently carries out the purifying treatment of oily(waste)water respectively, the water that oil that oil outlet is discharged and water outlet are discharged is pooled to respectively in the same pipeline, and this mode of operation can improve the processing power of compact cyclone air-flotation Composite Can.
In sum, the gas-liquid mixture of oily(waste)water enters the jar from the tangential inlet on tank body top, forms eddy flow in jar.Simultaneously, the bubble that is evenly distributed in the oily(waste)water under the gas-liquid mixed pumping action is separated out in jar, the oily(waste)water in the jar is carried out air supporting handle.Therefore, the light matter matter such as bubble that are stained with oil droplet move to tank deck; Current and solid phase particles etc. move at the bottom of jar than heavy substance, when arriving the injection air supporting zone of Composite Can bottom, by injector oily(waste)water are carried out secondary air supporting and handle.So oily(waste)water is equivalent to carry out a cyclonic separation and twice dissolved air flotation in jar, can reach satisfied treatment effect.
Claims (8)
1, a kind of compact cyclone air-flotation separation equipment for processing oily wastewater, mainly by cyclone air-flotation Composite Can (1), recycle gas assembly (2), gas-liquid mixed assembly (3) and pump around circuit water assembly (4) are formed, it is characterized in that: by cylindrical outer cylinder body (11), oval upper cover (12) and oval lower cover (13) are formed the tank body of cyclone air-flotation Composite Can (1), recycle gas outlet (21) wherein is installed on upper cover (12), oil outlet flange (121) and gas safety valve (126), oil outlet flange (121) is connected with interior outstanding pipe (123) in the inner core (14), afterbody of outstanding pipe (123) is provided with fixed plate (124) and goes out oil groove (125) in it, the bottom of outer cylinder body (11) is equiped with pump around circuit water inlet (41), and be connected with tube internal reflux water lines (42), the end of its internal reflux water lines (42) is connected with air supporting injector (43), the middle and upper part of air supporting injector (43) is provided with injector inlet mouth (431), the below is provided with discoid air supporting baffle plate (432), lower surface (5～10) mm apart from air supporting injector (43), in the lower cover (13) of outer cylinder body (11), the top of lower cover water outlet (131) is provided with a horizontal plectane (133), and and lower cover (13) between form a circular water stream channel (134), be provided with filter screen (135) around the horizontal plectane (133), greasy filth outlet (132) also is installed on lower cover (13); Inner core (14) is made up of spherical crown shape skimming tank (141) and cylindric oil tube (142), spination overflow weir (143) is made in the upper end of its spherical crown shape skimming tank (141), the bottom of inner core (14) and interior outstanding pipe (123) are affixed, the distance H between the upper limb of cylindric outer cylinder body (11) and spherical crown shape skimming tank (141) upper limb
1=50mm, inner core (14) bottom margin is apart from the upper limb distance H of outer cylinder body (11)
2=(1/3～3/5) H; Gas circulation pipeline (24) is connected with gas circulation line (23) in recycle gas outlet (21), recycle gas inlet (22), the tube, and gas circulation line (23) is connected the common recycle gas assembly (2) of forming in the tube with the inlet mouth (431) of air supporting injector (43); Top in outer cylinder body (11), being provided with inlet guide card (31) is fixed on the inwall of outer cylinder body (11) around inner core (14), its guide card initiating terminal (32) is connected with the terminal smooth transition of the inlet tube of tangential inlet pipe (34), inlet guide card (31) is provided with along barrel circumferential direction spiral ring, should leave certain radius clearance between the outside surface of inlet guide card (31) and inner core (14), the inlet (37) of tangential inlet pipe (34) is connected with gas-liquid mixing pump (36) by pipeline (35), thus inlet guide card (31), tangential inlet pipe (34), pipeline (35) and gas-liquid mixing pump (36) are formed gas-liquid mixed assembly (3) jointly; By water inlet pipe (441), Y-tube (442) and water shoot (443) connect and compose intake-discharge pipe (44), and the water-in (444) by intake-discharge pipe (44) is connected with lower cover water outlet (131), pump around circuit water pump (45) is connected with pump around circuit water inlet (41) by tube external reflux water lines (46), and air supporting injector (43), air supporting baffle plate (432), tube internal reflux water lines (42), pump around circuit water inlet (41), tube external reflux water lines (46), pump around circuit water pump (45) and intake-discharge pipe (44) are formed water pumparound assembly (4) jointly.
2, compact cyclone air-flotation separation equipment for processing oily wastewater according to claim 1 is characterized in that: the inner core (14) of cyclone air-flotation Composite Can (1) is 0.3～0.6 with the ideal value of outer cylinder body (11) tube natural scale.
3, compact cyclone air-flotation separation equipment for processing oily wastewater according to claim 1 is characterized in that: the diameter of horizontal plectane (133) should be 3～5 times of lower cover water outlet (131) diameter.
4, compact cyclone air-flotation separation equipment for processing oily wastewater according to claim 1, it is characterized in that: the lead angle of inlet guide card is 5 °～15 °, and inlet guide card (31) is 210 °～330 ° with the inscribed angle of outer cylinder body (11) inwall intersecting lens projection on horizontal plane; Radius clearance between inlet guide card (31) and inner core (14) outside surface is about inner core (14) and 0.2～0.35 of outer cylinder body (11) diameter difference.
5, compact cyclone air-flotation separation equipment for processing oily wastewater according to claim 1, it is characterized in that: air supporting injector (43), mainly form by cylindrical section (433), suction opening (434), contraction section (435), suction muffler (436), throat (437) and expansion section (438), wherein the top of air supporting injector (43) is connected with tube internal reflux water lines (42) by flange, and suction opening (434) is connected with gas circulation pipeline (23) in the tube.
6, compact cyclone air-flotation separation equipment for processing oily wastewater according to claim 1, it is characterized in that: can be connected with pump around circuit water pump (45) by tube external reflux water lines (46) at laterally disposed two the air supporting injectors in the external bottom of outer cylinder body (11) (43).
7, compact cyclone air-flotation separation equipment for processing oily wastewater according to claim 1, it is characterized in that: cyclone air-flotation Composite Can (1), different mining according to the working flow demand makes up with series system, with the water outlet of the last Composite Can water inlet as next Composite Can.
8, compact cyclone air-flotation separation equipment for processing oily wastewater according to claim 1, it is characterized in that: cyclone air-flotation Composite Can (1), different mining according to the working flow demand makes up with parallel way, and oil outlet and water outlet are pooled to the unification pipeline respectively.
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